<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div style="display: flex; align-items: center">
        <img src="../assets/logo2.png" alt="" style="width: 55px; height: 55px" />
        <span style="margin-left: 15px">电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff"
         active-text-color="#409EFF" :unique-opened="true" 
         :collapse="isCollapse" :collapse-transition="false" 
         :router="true" :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模版区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
            :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-container>
        <!-- 右侧内容主体 -->
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </el-container>
</template>

<script>
export default {
    data(){
        return {
            // 左侧菜单数据
            menuList:[],
            iconsObj:{
                '125':'el-icon-user-solid',
                '103':'el-icon-s-help',
                '101':'el-icon-s-goods',
                '102':'el-icon-s-order',
                '145':'el-icon-s-data',
            },
            // 是否折叠
            isCollapse:false,
            // 被激活的链接地址
            activePath:'',
        }
    },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login"); //router.replace
    },
    // 获取所有的菜单
    async getMenuList(){
        const {data:res} = await this.$http.get('menus');
        if(res.meta.status !== 200)
        {
            return this.$message.error(res.meta.msg)
        }
        this.menuList = res.data;
        console.log(res);
    },
    // 点击按钮 切换菜单的折叠与展开
    toggleCollapse(){
        this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath;
    },
  },
};
</script>

<style scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
}
.el-aside {
  background-color: #333744;
}
/*为了消除展开时多出来的边框*/
.el-submenu{
    width: 200px;
}
/*
.el-main {
  background-color: #eee;
}
*/
/*给图标后面加个边距*/
i{
    margin-right: 10px;
}
.toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>
